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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03113c1f75f2e8d72eb00e3d055b634d1ca3e2554c1f307a591270506f61febf' 
  AND token = 'FY3OW9sOpEDksj+DMYsivUo3eEKVIZ5ZkwkbGNvI4Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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