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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd5811ba0e1a239070cada923e6dc4b6505866c15e04b4b7e79f331386b1ac48' 
  AND token = 'dvRaR5tXY6QyFcBzo4IrdSQSeg9vZ1bce0oQz6MGftY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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