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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c10a20bf0a816b44172f4ddda2d4d162fae9b35c60daf7443f2683c866e699' 
  AND token = 'otqJBlG3xcPkIFI6rQl2CsNCVmUtdO1zr04MBO6MUcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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