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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47135365164507590b258d8fb1fad290b894fa3e42388bc906390b46d0982a0c' 
  AND token = '1rDK7rKVdTw5o1lpxaaYukihwhTONRrRnZc2yCWgT2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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