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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a0a8948a19945c240865fa499c5bcc407cf96aa73cfdb4f96b1c51c4fe9dfca' 
  AND token = 'I3OpvDTE6jyFEwSOupCIwxRhvjM7x4I2aIr9GuoKZs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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