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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5597e77fe70801fd6984b1378656e39a3f4245b90a9f739e5bd923649240d2ad' 
  AND token = 'reV3vtzbrXdOZyiSNR7VQ6lZnuIqCuI6hAuuNxb8Ebk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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