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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acd2b650114abf4e38ebdfb1d34f27adc6adc5ad90f55de52bd552e8a73c4553' 
  AND token = 'UI00KLslsV57OZE5GVWcOgTULPLzVkydxmLteX/HXQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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