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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e82c34d79466df16b8d173ac4a0fe8cbf7a206bc851f7adc37533bc519cce2c' 
  AND token = 'dKm5d17kTuDGxWbtDstb3pfvBM0s06ZJIMTJLi4CIm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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