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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceebfe3ad4d6c16388438ef54e83b61d748e6be26f49e548ddf88c1e1b56a714' 
  AND token = 'wBoEKyi0A5czbrcpjMxI+6Yjbi7aCDSqiu0dj3KKLsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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