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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '988ea7a0c957bb758805d9fc3b841b1a5cc0f738b6faa60c0bebfac129bfd156' 
  AND token = 'kjmTon4vT9xOuECb4ISAfmOgn5cdqG/EFCpr+a24xIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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