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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df4651d17910e3fd6f697b4090fbdd5c6b03673921a31b4d02820e56d58720fa' 
  AND token = 'eeKJJ4ZcPoJssmQOhUHMMYMU3p5t5Oitlc8fNq//ADs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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