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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cac1eaf39b127e68a3ebb75b7ae4812a57054f338e03c736a4e737eb752d23b0' 
  AND token = '57RjmJGCFawrvgrF88eo4jfnqfAg7/YykQpQUhGPt+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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