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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9a2193c9127b9f87ffd44c5bd450bcca9428fc3aa0ad389f89caf7ac400bc00' 
  AND token = '5U3b7degYkv8zu3VAeg4ef73jCmUrvKvRugWRvszkGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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