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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fae8b825b7b8a4f96f7a609c95758cd91581a28f961cda27c70dd746d1cb08a' 
  AND token = '+sTaZVHR2D4zPWcWa0YVCR2OCIJfBOPJeJ+NipG5pkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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