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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '365e9a519e8078c35e8edfd273b859ec755e2cd965644f140ad38c53a3ad2920' 
  AND token = 'k9HWK/3OCR8ksaoqn3HQVY0umFofI4LCh2xbBMVjF78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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