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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9556181001d1f4b5c65a03dd3c1319a6572a3ed6f4e81daba8888ead49690690' 
  AND token = 'r34WFb2NvjjAzi0+29Be5aTsTp0JASER+998iv55b/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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