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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8670fcd4ace5095be13b2b2de84ae969e2b3dca1c9cf9edad36205dc977c006a' 
  AND token = 'zEy4zcIKHRk9jhV6wvFbU2dDjHM7h5pE6AN61wN5HAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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