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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d09ba46c65a0e7f27c939a41459372a092ebb0d8741570d202b41bdd7e40cfb' 
  AND token = 'HEM8jXRS0eTmvdAjyn9n6qVz/4lz6GmmLIPXjRfiZng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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