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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7bd917327daae2d14da780f82045d2c93767d4776917af8f6cf5eec7ade7391' 
  AND token = 'NrD120VPJVoruEKsRUGoo0loFv2wergaW4cUPxo0zuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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