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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04eb85015fc5ab4bbe613b619f2ccfd885795fe2c0567e3e55ca18b6a0fc2549' 
  AND token = 'GvET4NcvKZweGvb6m4QQwOXOU4GXicRfTu3UWnTUHHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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