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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efadef929c275657952f91e08cd783bb53ebc5ae274f1177adec7ea72b358161' 
  AND token = '3OpdEJSdj0LdGzk947ywTrkJN0BlN0aPTFY2OXq5l/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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