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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6cbe2c434789d07eb8bca53bf3b75a2dd72f7ebfa5ad38b6fba5cb6f2b7af42' 
  AND token = 'Na+ERN5NM+OUHsuPQhcPIFfg/SqI0n+b3Uz8egyXYxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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