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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e67d6c3e813a7e3c06c710d922b81311628d7aa4ec94d4785e806c4dabac3bcc' 
  AND token = 'iI+DveLaZHM0Hf/Qe51sYUQHhzi3QLmrYQGNMDkStho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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