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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b69ffdc7e4990a8b02f87800364620d7fc30f6be6454e284791823d4f53f5068' 
  AND token = 'FFFeArXq5pXajOOkwHYkfXwL27ywzPKFuIwOOwS9ICY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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