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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8cd6ceeedb687dff4b75166d952635ba0e0bc6f20b4767d6aaaf0e43dd8793b' 
  AND token = '2HyvnrG+KtaYoyn2+zpZAa5HLd3e/Tc7Po2YcP2RgDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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