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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dab410eda3619a43d77b0a848bb467fe75410634a166a12cd5bb1f4a5b22406a' 
  AND token = '6CUo2ul7q9DVAdbeNGreEoceJnglv6tcZT277F/pDJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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