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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54104d036977766fbe795ede298f44bf17e3c14513a07d2672a6fefcb7e1417d' 
  AND token = '3FR7UHC5wfWs0703L27yfRM2z1e1OJsatVKBGewObPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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