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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c26159fd21dde0f0db401dd53ad0416b444533911a9fcee289e279ff76e150d' 
  AND token = 'Go95oSyrQSi0MK42tzmOBlX8/7pLqMBFq/hOLAqpdqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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