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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa7e04415a36ddcc50c54e6e08514f62ce5ccd2998c1fdeff18a12102e122133' 
  AND token = '+o3fRJARX4+Zo2de6BCxxFBZdtdbusrso1t+A7/JaHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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