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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2469062623249f97efa9251ac83635800019727d8e9f97b92723810911d981d7' 
  AND token = '/uyuR0c3PlXSOiqJ7/fYtBwaePLLeRYQVqQmyybnQ4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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