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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf61a61e78e76e81e3acf2c9715a5cfd40a03b8dd5fa32653eb3174a0cf6a29a' 
  AND token = 'Reu56W87aeTRiEoFwV3kPQpoW2NyVDs6s+pNjAeVjro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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