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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5361247359a89b3a15f5742c930b8d699c8ced28781a85b03399969054894d80' 
  AND token = 'Ilyk0asqcqPHq8UHCsoSbzAEJ88qGc5kaYmB8+Kx6Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}