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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f3850d108dcda4f8950eec9139ef52ab821452f256c080c279357317f9d5dac' 
  AND token = 'BhhV2in13zLBZpahidOsWVr0qnAVQTsvfo3X4fVcrvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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