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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92761d8c5e650677569a6be9ebb08cfb51b10e8b2935de2400efca22f98cf50f' 
  AND token = 'ew0j8rWaUdKgD2AWwhMG+A0XDmpY1GEwxOpb0Fme7Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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