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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64bcbfe32702956cc22a61060ba944f9301663e9fbdde92bc567c6eb06d18ac9' 
  AND token = 'sy0lgvGKh6iuo6xGq4NDKyqyEzGTQKs4uqlU+ptx2BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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