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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '984fa670d8e5fb9bca999f5379b0ac34d6617d9489f591968d4991dbe4f950dc' 
  AND token = 'xG39n/EzJ5e+VGnQqVDWspCQnEqrdd4Vzcv6cMZnHy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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