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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fbd3e04e78d09e523e1101101fe326a43acecadd03c81dae10865d49840db22' 
  AND token = 'TXAPLvpQ77TgExtxY/fLwcI4I+bnXUJXxi1GpfZ3Sew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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