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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4616b028891c8331f1952777001c52b7bd4507e7ead6702e3feb8a6f3a7221d' 
  AND token = 'DU/3VqnlZY33bb7M3IDJbKhUhoMfC/i29YS8QSs11Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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