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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de1fca1ae5eefcd5f175e1069395dab4318a07ad32f24cb779e820d5f78a94af' 
  AND token = 'FUekNMzJFeDbxPXyIIepBwkT8xPH/71Z21dF1PjJCOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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