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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2613c0a03bac2f54bddf934e86859ee3b89e4480c5ee6a54f4adaea8a3a248f3' 
  AND token = 'WNg1BL5T25ThWPGkLTFBS1NyZO34cYj5YMltTr71GIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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