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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6710b9333cf14153f5c7daef45ccb1484330b4e4d61f955d00dea181f9a3405f' 
  AND token = 'iL71kiLZnAsbIV9qFM2t+q8liMeHPED/oGzPGjSC680=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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