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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ef33cae7a708bcd15536dec5af46ea692d6e8f0540d94c82b2a101064ebdb5' 
  AND token = 'V+a3VaXTzPzWMzNaLHGz3ZNHuniMH2BzRGcfNparRto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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