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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7588f8f5554f328af4735e03facc630e5579de6b78cce8e54f2a31c317a8d9' 
  AND token = '9i3UhT3qjPvgQ5nU9hp92Ky/unCg7yPK3y27vj33OO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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