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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e4eaa4ee4147d9d11b1614536ed02253339d75da7950f9535e8272236e99865' 
  AND token = 'ERwmCsCXCkVmSG8P6qlDNmYrdqxxSI/3AZgO01febxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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