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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54a5e4fed02d1571d7ee972d54fa0d9ef562aed51df369c9d65e13d47d845009' 
  AND token = '56uCzpjEijHoA41cZw683pK8REjDkafrn5GFVbtifLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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