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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24a97a8c493d474e2d69e28246c4b4fa850c9662e67b34b21517529a330b971f' 
  AND token = 'LaG3Ear2lNXkTjAaCXM12LmwR1jNx22L1pPGsczuo48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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