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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f8b3f2bcf0008720354ac4e3a2baaa28f9a71b20a72467f191db4bfc6e43030' 
  AND token = 'NQXccuE5bSz0qP0/5zG7/nglDnf8F060tStbSvrGymM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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