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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6fe58ef4962265e4667810d66ec08f22e099a8e9abadda20c8cac3503edae3a' 
  AND token = 'B8jApCY6jScv9xFHEBYhO7j6avMz9/LMhi/NHD/8Hzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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