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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfdff6c66698436a6bcb9dab95ead0a461c23abed8116d0c8e377ed8e05c69c6' 
  AND token = 'szRrkjj7zzYnU0YQfYO8BCBxEzjMN7eWx8lI4JlDJqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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