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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c0f419dbf5644949cda8e0512913acce1db0af55007eb5558c52e6d071458a' 
  AND token = 'sbMAc6rWHB6F3tD418nOY4X4vNfYcGIR/Ze2XBpwzJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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