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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c961fbe51df22c835ec68b11d81796109ea8fc3d7824584825c82de9fd82be' 
  AND token = 'e9mcaSkJe+a9pOCrCzsCfuYBjUfYP6J1/+YSHvarK1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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