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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '505d5f335db9a3c9147ca3b8fe2615e1374190600d7c7fac9e12e10684f675dc' 
  AND token = 'm1XXQxp1XJxsbMEzP6T2Oo69Q8rcR9hpPiPQPvC461w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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