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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45c74eacd9d4ea871a1a98301f4dc8127ff4538ddae8282042171c07ab562659' 
  AND token = 'XWMw9s+uid83RmsLvB5KSMv2BfKZQWfu2ozF40R12E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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