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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c47989ea4eb21008e4c82c4eaf35710ff8c5dab4b04e3e2e2c169a4d3ad84d83' 
  AND token = 'zlua+bGzx3sPu3mN/AVsYohSRgnTnIPwA9csgE7i/QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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