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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89b714071bd0214e6cb505b9474b86d05f88dc247d05e6c013ef1ea80b978e0e' 
  AND token = 'dtj6Ak/X4oAR5S8OPDwdChtok6rTSnzAwdql+/DD3IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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