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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f913a60ba0bc1eaa29ce7530149bf1641db11e88b6b74d2c052f16657fbcf0af' 
  AND token = 'CG3a6O7wqBFV3e4OvH02pp6KiREoSd9lNZUOcWEDJK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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