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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e03728c362cd4ab84d7ed317b785f90e4f04b1186d85e5e8ca03f2dd3def3da' 
  AND token = 'Bg1Va7/jY8EskwDZ3r4iatOxIR0+Kw/clMqKygkf/xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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